2014 vs. 2015 Attendance

We take the number of home games through the
current date for each team, then look at the same number of home games
last year, and compare the attendance between those two sets of games.
This means that the dates won't match up, but given the differing
capacities of ballparks I believe this gives a more accurate view.
Also, all single-admission doubleheaders are
counted only once in the attendance total and a zero is used for the
other game of the doubleheader.